CN107243504B

CN107243504B - Closed-loop garbage digestion and saline-alkali land desertification land and garbage yard in-situ remediation method

Info

Publication number: CN107243504B
Application number: CN201710594234.7A
Authority: CN
Inventors: 王�锋
Original assignee: Beijing Lv'an Chuanghua Environmental Protection Technology Co ltd
Current assignee: Beijing Lv'an Chuanghua Environmental Protection Technology Co ltd
Priority date: 2017-07-20
Filing date: 2017-07-20
Publication date: 2020-07-24
Anticipated expiration: 2037-07-20
Also published as: CN107243504A

Abstract

The invention provides a closed-loop garbage digestion and saline-alkali land desertification land and garbage yard in-situ remediation method, which comprises the following steps: firstly, classifying the garbage; adding microbial flora in cow rumen to rapidly decompose fiber in garbage and rapidly decompose starch garbage; after the rapid decomposition and decay, the mixed thermophilic bacteria group which can degrade starch, protein and decompose wood fiber at high temperature is added for continuous fermentation, and the lactic acid bacteria group is added for removing heavy metals. Adding plant ash after drying to prepare a soil remediation agent; treating saline-alkali desertification soil, and fully mixing the prepared soil remediation agent with the soil to remediate the soil. The invention can avoid pollution source from source. Waste is changed into valuable and beneficial to returning to nature.

Description

Closed-loop garbage digestion and saline-alkali land desertification land and garbage yard in-situ remediation method

Technical Field

The invention belongs to the technical field of environmental protection and ecological system reconstruction and restoration, relates to a method for environmental management and ecological system restoration, and particularly relates to a method for closed-loop waste digestion and restoration of saline-alkali land desertification land and garbage yard in-situ restoration.

Technical Field

The amount of garbage stored in China is about 100 hundred million tons, the effective disposal rate of more than 20 hundred million tons of new garbage generated every year is less than half, the amount of organic garbage is more than half, and the natural corrosion of the organic garbage causes huge pollution to the environment. With the acceleration of urbanization progress in China, the treatment capacity of urban greening garbage, kitchen garbage and urban sewage is continuously increased, and a large amount of sludge and other organic garbage are generated. The garbage enclosing city is serious, a great amount of mosquito and bacteria are bred in the foul smell of the garbage site to form a source for transmitting germs, and the health of residents is seriously influenced! The consumption of the stored garbage becomes a serious problem in the development of cities. The domestic organic garbage such as rural straws, human and animal excreta and the like become main pollution sources, the gas generated in the decomposition process of the organic garbage pollutes air, and the decomposed garbage liquid flows into rivers along with rainwater to permeate underground to pollute underground water sources, so that the organic garbage becomes the most main pollution source. The existing main methods for treating garbage comprise: (1) the landfill occupies a large amount of land and is obviously not suitable for the situation of China with few land and many people. In the landfill process, the secondary hazard generated is ignored all the time, and all organic matters are decomposed into harmful gases in the landfill: carbon monoxide, carbon dioxide, carbon oxide gas, nitrogen oxide gas and sulfide gas are released into the atmosphere to pollute the air, which is also a main cause of haze. (2) Composting, wherein organic garbage is subjected to corrosion fermentation, the organic garbage decomposes the same harmful gas in the fermentation and corrosion process, the produced polluted water can downwards permeate and pollute an underground water source, and the produced harm is almost similar to the harm produced by landfill. But also produces poor economic benefits. (3) The biogas preparation is beneficial to preparing biogas by an organic matter fermentation method in recent years, but the biogas preparation cannot be popularized and popularized all the time, and the main reasons are that the cost for preparing biogas is too high, factories for preparing pure biogas generally lose loss, the utilization rate of biogas residues is not high, the enthusiasm of farmers for using the biogas residues is not high, and the benefit of the biogas residues on improving production is not great. (4) Incineration and incineration become the main way of organic waste treatment, but the investment of waste incineration plants is huge, the current technical standard of the flue gas discharged by incineration cannot reach the standard, and the pollution to the surrounding environment is caused.

The soil is an important component of a land ecosystem, is an irreplaceable environmental factor for human and animal living, the safety of grains, fruits and vegetables depends on the health of the soil, and the healthy soil is also a basic guarantee for food safety and human health. With the development of industrial and agricultural production and urbanization of villages, the area of polluted soil is continuously enlarged, and the area of saline-alkali soil all over the world is 9.5438 hundred million hectares, wherein 9913 million hectares are in China. Most saline-alkali desertification soil cannot be cultivated, the saline-alkali desertification and the desertification are more and more serious, and the task of repairing the soil is heavy.

At present, the saline-alkali land desertification land treatment mainly comprises 3 methods, namely, establishing a perfect drainage and irrigation system through water conservancy improvement, separating irrigation and drainage, strengthening water management, strictly controlling the water level of underground water, and continuously leaching and draining the salt in the soil through irrigation flushing, flood diversion, silt discharge and the like. The existing problem is that a large amount of fresh water is needed, and China is a country with serious shortage of fresh water! The agricultural technology improvement improves soil components and structure by deep ploughing, land leveling, additional soil, grass covering, silt turning, sand covering, additional application of organic fertilizer and the like, enhances soil permeability, accelerates salt leaching, and has little effect at present. The chemical improvement is to apply modifiers such as gypsum, black alum and the like to alkaline earth, alkaline soil and soda saline soil, reduce or eliminate the alkali content of the soil and improve the physical and chemical properties of the soil. Various measures are used, and the defects and the advantages are better according to local conditions. But cannot permanently solve the problem of saline-alkali soil and is easy to cause secondary harm! Too high production cost and unable to be popularized in large area! It is also difficult to rapidly cultivate plants because of poor soil retention and insufficient nutrients to keep the plants difficult to survive, and there are many technical difficulties in using.

Disclosure of Invention

The invention provides a closed-loop ecological soil restoration integrated system, which aims to overcome the defects of the prior art and provide a treatment mode of garbage absorption and cyclic utilization and zero emission, a saline-alkali and desertified soil treatment method and an ecological system restoration method thereof.

The technical scheme of the invention comprises a garbage treatment technology, a fermentation biogas preparation method, a repairing agent preparation technology, a soil repairing method, a seed selection method and a plant variety planting method.

The garbage is classified firstly, the construction garbage is crushed to manufacture highway base materials or bricks, and the waste plastics are heated and pressed to form city slope protection bricks. The organic garbage is pulverized into particles with particle size of less than 6mm, and biological deodorant can be added. Preliminarily reducing odor, facilitating subsequent operation for later use, adding water into the organic garbage (including kitchen garbage, human and animal excreta, greening garbage, straw and other organic matter residues, which are collectively called organic garbage) to ensure that the water content is about 87 percent and the organic garbage content is about 13 percent, and filling the organic garbage into a fermentation tank to be heated to 38 ℃ for later use;

adding microbial flora in cow rumen, rapidly decomposing fiber in garbage and rapidly decomposing starch garbage, wherein the microbial flora in cow rumen is cultured by selecting healthy and mild adult cow, feeding no or little concentrate 5 days before liquid collection, mainly feeding dry coarse straw, dry enzyme, storing for 10 hours, ruminating overnight, selecting 8 o' clock, inserting into stomach tube with lubricant-coated gastric tube slowly from nostril, collecting the outer end of the tube with vacuum bottle, lowering head slightly, creeping along with rumen, allowing gastric juice to flow into bottle for 20 minutes, collecting 5L, collecting once bovine gastric juice, culturing, preparing seed material and subculture, mixing 5 kg of bean stem, straw, corn stalk, wheat straw (1:1:1), adding 1% salt 0.05 kg, 1% urea 0.05 kg, collecting 50 deg.C hot water 35 kg (dry coarse straw, salt, small amount of wheat straw, etc.), fermenting with urea, fermenting at pH of 358-3 deg.C, fermenting with water, fermenting at 3-40 deg.C, fermenting, adding urea, fermenting at pH of about 10-40 deg.C, fermenting at about 3-3 deg.C, fermenting, adding urea, fermenting at pH of about 3-40 deg.C, fermenting, adding water, fermenting for about 3-3 times, fermenting, adding urea, fermenting, adding water, fermenting, adding water and fermenting for about 3-3 times of organic matter, fermenting, adding water, fermenting for about 3 times of organic.

And (3) performing second round anaerobic fermentation on the mixed flora, adding methane bacteria and simultaneously adding a mixed thermophilic flora capable of degrading starch, protein and decomposing wood fiber at high temperature: thermomonospora fusca (Thermomonospora fusca) (accession number CC TCC AB 93039); high-temperature protein degrading bacteria: thermoactinomyces vulgaris (Thermoactinomyces vulgaris) (accession number ACCC 41061); high-temperature degradation of wood fiber bacteria: trichoderma asperellum (preservation number CGMCC13766) (the ratio of the strains is 0-5: 0-5, and the numerical range does not contain 0). The fermentation tank is at normal temperature (35-40 deg.C), stirring thoroughly for 12 times per day, and fermenting the organic garbage for 10 days.

And on the 13 th day, adding mixed syntropy baru composite lactic acid bacteria group to ensure that the lactic acid bacteria group is fully mixed and propagated for 2 days. The lactic acid bacteria adsorb heavy metal ions to form heavy metal ion clusters, and the heavy metal ion clusters are separated by electrode adsorption. The acid complexes heavy metal ions such as mercury, lead, zinc, cadmium, chromium, nickel and the like to achieve the aim of removing the heavy metal; the lactobacillus group is liquid Baru composite lactobacillus, and the input proportion accounts for five ten-thousandth of the total substance.

On day 15, the temperature is kept for 1 day after reaching more than 65 ℃; thermophilic methanogenic bacteria are added to generate high temperature effective components for killing germs.

In 15 days, the biogas is discharged completely, the organic matters are basically decomposed, the odor disappears, the temperature is reduced to be below 40 ℃, the biogas slurry is separated and then continuously recycled for fermentation to prepare the biogas, and a centrifuge separates organic garbage (biogas residues) to reduce the water content to be below 35 percent. Separating biogas residues to become a nutrient carrier of the flora, adding homodromous lactic acid flora, adding various beneficial flora such as silicate flora, bacillus subtilis, rhizobium and the like (the adding ratio is 0-5: 0-5), and continuously culturing the flora at normal temperature to generate biological flora. Adding 1% of plant ash, fully mixing, and drying to prepare the soil remediation agent. Keeping the water content at 20%, crushing, packaging into 100 KG/bag, and storing in warehouse at normal temperature for later use.

The saline-alkali desertification soil is treated, the prepared soil remediation agent is fully mixed with the soil, and the flora of the soil remediation agent balances the acid and alkali of the soil to generate substances such as polysaccharide, polypeptide, nucleic acid and the like to nourish and remediate the soil.

Advantageous effects

The invention has deep significance: (1) the biogas prepared from the circular economy organic garbage can completely replace imported natural gas, and solves the problem of national energy safety by breaking resource shortage. (2) Organic waste resource utilization and reduced fertilizer usage. (3) Blocking the pollution gas generated by the decomposition of organic matters from the source, and making important contribution to the atmospheric pollution control and the emission reduction of greenhouse gas! (4) Solves the problem of organic garbage consumption, changes the treatment method of organic garbage and the circulating system of soil remediation, and overturns the traditional treatment method and treatment method.

Drawings

FIG. 1 is a diagram: closed-loop organic garbage treatment and restoration of saline-alkali and desertification and garbage field circulation schematic diagram

FIG. 2 is a diagram of: schematic diagram of organic waste fermenter, wherein:

1. feed inlet 6, back flow

2. Liquid receiving sprayer 7 and stirring/heating device

3. Air inlet pipe 8 and discharge hole

4. Heavy metal separator for methane pipeline 9 and electrode

5. Torch

Examples

Example 1 method for ecological restoration of closed-loop saline-alkali wasteland and refuse dump, taking the restoration of refuse dump of shores in the city of State of Tte as an example:

in a village garbage field repaired in 2011, before repair, wind-blown garbage flies all the day, rainy days and black and odorous water overflows, odorous mosquitoes, flies, mice and rats fill the field, and people around complain of vocal tracks. The city government has decided to make ecological remediation and we provide a solution to be adopted.

And step one, garbage classification.

The garbage field occupies 200 mu of land, and the main component is 15 ten thousand tons of household garbage. After analysis, we used a direct shift garbage removal method. A fermentation biogas production plant is built in a refuse dump, and 15 biogas fermentation tanks of 3000 cubic meters are built according to the design of treating 400 tons of refuse daily, and the adopted technical scheme is as follows: classifying the garbage, crushing the building garbage to manufacture a highway base material, and heating and pressing the waste plastic to form the urban slope protection brick. The organic garbage (including kitchen garbage, human and animal excreta, greening garbage, straw and other organic matter residues are collectively called organic garbage) which is sorted out is crushed into particles with the particle size of less than 6mm, and a biological deodorant can be properly added. Primarily reducing odor, adding water to make water content be about 87% and organic matter content be about 13%, placing into biogas fermentation tank, and heating to 38 deg.C for use.

And in the second step, microbial flora in the rumen of the cattle is added to quickly decompose fiber in the garbage and quickly decompose starch garbage.

The microbial population in the rumen of cattle is cultured by selecting healthy and mild adult cattle, feeding no or little concentrate 5 days before liquid collection, mainly feeding bean stalks, rice straws, corn stalks and wheat straws (1:1:1:1) which are used as fermented feed, keeping no feed for 10 hours at 8 o' clock in the morning, ruminating at night, slowly inserting a stomach catheter tube coated with a lubricant into the stomach from nostrils, taking the outer end of the catheter tube by a vacuum flask, making the cattle head slightly lower after 5 minutes, creeping along with the rumen, making the gastric juice flow into the bottle, taking 5L after about 20 minutes, taking the bovine gastric juice once, and subculturing for half a year.

Preparing a seed material: taking 5 kg of bean stalks, straws and corn stalks (1:1:1), adding 0.05 kg of 1% of salt and 0.1 kg of 1% of urea. 35 kg of hot water (seven times of dry coarse material) at 50 ℃ is taken in advance. Dissolving salt, urea and the like, adding 0.2-0.3 kg of plant ash, adjusting the pH value to 9, and pouring 5 kg of bean stalks, rice straws, corn stalks and wheat straws (1:1:1:1) into a cylinder to be fully mixed with the solution. When the pH value reaches 8, the temperature is reduced to 40 ℃, the bovine gastric juice is poured into the mixture, the mixture is finely and uniformly stirred, and the upper jar opening is covered by plastic cloth to pump air out. Fermenting for 24 hours to obtain the seed material.

Culturing microbial anaerobic protozoa, bacteria and fungi in the rumen of cattle, rapidly decomposing fibers in the garbage and rapidly decomposing starch garbage. The ciliates can tear the cellulose to loosen and break the organic matters, which is beneficial to the fermentation of bacteria. Rumen flora bacteria, cellulolytic bacteria, proteolytic bacteria, protein synthesis bacteria, vitamin synthesis bacteria, etc. Especially has strong rapid decomposition force on cellulose. Ciliates phagocytose and digest bacteria, utilize bacteria as a source of nutrients, and utilize bacterial enzymes to digest nutrients. The microbial digestion and metabolism process is one fast organic garbage decomposing and decomposing process.

Thirdly, quickly decomposing and decomposing the decomposed organic garbage to prepare the biogas and utilizing the biogas residues to prepare the soil remediation agent

(1) Inoculating the seed liquid obtained in the step into the pretreated organic garbage raw material, and uniformly mixing and stirring various pretreated substances, wherein the dry substance accounts for about 13% and the water accounts for about 87%; then the prepared organic garbage is put into a fermentation tank for fermentation to rapidly decompose and decompose organic matters; performing the first fermentation at 35-40 deg.C and pH6-8, turning over 48 times per day for 2 days until the organic matter is completely decomposed.

(2) And (3) performing second round anaerobic fermentation on the mixed flora, adding methane bacteria and simultaneously adding a mixed thermophilic flora capable of degrading starch, protein and decomposing wood fiber at high temperature: thermomonospora fusca (Thermomonospora fusca) (preservation number CCTCC AB 93039); high-temperature protein degrading bacteria: thermoactinomyces vulgaris (Thermoactinomyces vulgaris) (accession number ACCC 41061); high-temperature degradation of wood fiber bacteria: trichoderma asperellum (preservation number CGMCC13766) (the ratio of the strains is 0-5: 0-5, and the numerical range does not contain 0). The temperature of the fermentation tank is normal temperature (35-40 ℃), the organic garbage is stirred for 12 times every day and fermented for 10 days.

(3) Adding mixed and homodromous composite lactobacillus group to allow the lactobacillus group to fully mix and propagate for 2 days. The lactobacillus adsorbs heavy metal ions to form heavy metal ion clusters, and the heavy metal ion clusters are separated by electrode adsorption. The acid complexes heavy metal ions such as mercury, lead, zinc, cadmium, chromium, nickel and the like to achieve the aim of removing the heavy metal; the lactobacillus group is liquid Baru composite lactobacillus, and the input proportion accounts for five ten-thousandth of the total substance.

(4) Later, the temperature is kept for 1 day when reaching more than 65 ℃; thermophilic methanogenic bacteria are added to generate high-temperature components which can effectively kill pathogenic bacteria.

(5) In 15 days, the biogas is discharged, the organic matters are basically decomposed, the odor disappears, the temperature is reduced to be below 40 ℃, the biogas slurry is separated and then continuously recycled for fermentation to prepare the biogas, and a centrifuge separates organic garbage (biogas residues) to reduce the water content to be below 35 percent. Separating biogas residues to become a nutrient carrier of the flora, adding homodromous lactic acid flora, adding various beneficial flora such as silicate flora, bacillus subtilis, rhizobium and the like (the adding ratio is 0-5: 0-5), and continuously breeding the flora at normal temperature to generate biological flora. Adding 1% of plant ash, fully mixing, and drying to prepare the soil remediation agent. Keeping the water content at 20%, crushing, packaging with 100 KG/generation, and storing in a warehouse at normal temperature for later use.

(6) The saline-alkali desertification soil is treated, the prepared soil remediation agent is fully mixed with the soil, and the flora of the soil remediation agent balances soil acid and alkali, and produces substances such as polysaccharide, polypeptide, nucleic acid and the like to nourish and remediate the soil.

The structure of the fermentation tank used therein is: the fermentation cylinder and sedimentation tank intercommunication, the fermentation cylinder has connect the inlet pipe, and the entry position of inlet pipe is higher than the exit position, and the upper portion of fermentation cylinder has connect the U-shaped overflow pipe, and the import position of U-shaped overflow pipe will be higher than the exit position of inlet pipe, is less than the entry position of inlet pipe. The middle part is equipped with the stirring device that generates heat, and the middle part of fermentation cylinder is equipped with charge device, and the device that generates heat is supported by the support, and the device and the agitator combination that generate heat form, have automatic discharging and feeding device, and automatic dehydration sets up dehydration liquid cyclic utilization.

Operation regulation and control parameters: fermentation gas production proper temperature: and (3) crushing degree of the organic garbage at 37-40 ℃: 2-10 mm, raw material gas production rate:>0.36m³/kg (organic refuse) and CH in marsh gas₄The content of the organic silicon compound is 50-60 percent, and the solid content is about 13 percent.

And fourthly, soil remediation. The method repairs saline-alkali soil of a sunshine farm in the state of Metaplexis for 1000 mu, and the saline-alkali soil with the salt content of 0.6-1.5% can hardly survive any plant.

In spring 3 months, the temperature of the ground is warmed up to be favorable for the growth of the microorganism bacteria. Construction constructs 37.3 mu into a unit (50 meters), totally 27 units. 4 meters of pay-off is reserved for the 48 meters of defense line, and a drainage irrigation ditch with the soil trenching aperture of 4 meters wide, the low width of 1.5 meters and the depth of 1.5 meters is taken from the 4 meters of defense line. The method is used for draining waterlogging and irrigating, then each unit land is leveled well, all the land blocks are soaked by water for 6 hours, then the water is discharged from drainage ditches, and the soil is aired for 3-7 days to ensure that the water content of the soil is 32%. The prepared soil repairing agent is put into 2 tons per mu, the sowing is uniform, a tractor with 1000 horsepower is used for deep ploughing, and the bottom soil is ploughed 30cm deep. Then, a long-tooth rake is used for uniformly turning and planing, so that the repairing agent and the soil are fully mixed on the surface layer of 0.4 m, and each unit land is leveled. And (4) ditching an inner ditch with the width of 30CM and the depth of 30CM at every 6 meters by using a ditcher.

Planting saline-alkali-resistant red zelkova schneideriana, selecting 2-year-old strong tree seedlings with 40CM soil balls, cutting off 30% of branches to guarantee life cycle, and ensuring the survival rate of seedlings without dehydration. Planting 185 plants per mu in 6 meters by 6 meters, and digging pits before planting. Planting tree pits with diameter of 80CM and depth of 40CM, compacting with fine soil, irrigating thoroughly when watering, and compacting with floating soil after two days. When the water content of the soil is lower than 35%, water can be sprayed, and flood irrigation cannot be carried out so as to prevent the salt content of the diluted deep soil from damaging the saplings. The market value of the sapling is 185 Yuan, and 1850 Yuan is invested per mu. The red zelkova schneideriana is a valuable wood and has high economic benefit. The saline-alkali tolerant paper mulberry is used as livestock feed in the middle of the paper mulberry, and the row spacing is 1.5 meters according to the standard of the zelkova schneideriana. Every Longzech can be used for interplanting 5 rows of paper mulberry with a plant spacing of 1 m. 444 seedlings can be planted per mu, 1 m thick and strong seedlings are selected, the cost is 0.5 yuan per mu, and the cost per mu is 222 yuan. Capital investment per acre is 2072 yuan in total.

The dry weight feed for the paper mulberry per mu is 2000-3000 kg, the annual yield of 1000 mu is 2000-3000 t, and more than 4000 ecological pigs are cultivated in the year. The profit is generated by 120 ten thousand yuan per year, and the acre of the broussonetia papyrifera increases by 1200 yuan. The red zelkova is a 12 cm landscape tree after 5 years, the market price is 200 yuan, 185 trees per mu are produced, 200 yuan/tree/year, 5 yuan/year, 7400 yuan/year. The economic benefit generated by the repaired saline-alkali soil is 8600 yuan/mu each year. The generated social effect is as follows: the paper mulberry and red beech leaves have villi, have the function of adsorbing PM2.5, have the function of adsorbing and decomposing sulfides in the air, and the biological bacteria decompose polysaccharide in the growth process of the trees, so that sandy soil saline alkali in soil is fused, and saline-alkali crop plant fertilizer is absorbed by the trees. The saline-alkali soil in the land is less than 0.1 percent after 5 years of growth, and the saline-alkali soil is completely eliminated. Pig manure generated by the feeding field is circulated back to the biogas production factory, and fermentation treatment is carried out to form an ecological closed-loop restoration production integration.

Example 2 value of the method for ecological restoration of closed-loop type saline-alkali wasteland and refuse dump

(1) Market value

The market price of the soil remediation agent is 1000 yuan/ton, and the income is 50 ten thousand per day. The income gross profit is 574250 yuan each day, and the garbage cleaning occasion generates 14356.25 ten thousand yuan of profit gross profit. 205 workers are arranged for solving the employment problem. The method comprises the steps of producing the refuse dump for 9 months, cleaning the refuse dump, applying the produced repairing agent for 2 tons per mu, deep ploughing and raking for two months, decomposing refuse residues by bacteria in the cultivated soil repairing agent, planting and adsorbing trees for ecological repair, detecting that the soil completely meets the basic farmland standard of the Ministry of agriculture in 2015, and using the State of Metaplexis government for commercial development in 2016. The whole soil restoration agent can restore 62500-100000 mu of serious saline-alkali soil.

(2) Ecological value

The energy-saving emission-reduction method comprises the following steps of (1) totalizing harmful gases such as carbon monoxide, methane gas, carbon dioxide, oxynitride gas and sulfur compound gas:

and (3) carbon monoxide emission reduction:

22.59 kg/ton 100000-2259 ton

Emission reduction of nitrogen oxides

3.62 kg/ton 100000-362 ton

Emission reduction of carbon dioxide

330 kg/ton 100000-33000-ton

Therefore, the method related by the application can be used for harmlessly absorbing and recycling the municipal refuse, repairing municipal refuse and landfill sites, and repairing saline-alkali soil and desertification soil with the output products. The method for restoring vegetation and rebuilding an ecosystem by saline-alkali soil is also an integrated system for organic waste digestion, air pollutant treatment and saline-alkali soil restoration in the field of environmental protection. Energy conservation and emission reduction can avoid pollution sources from the source. Waste is changed into valuable and beneficial to returning to nature.

Claims

1. A closed-loop method for waste digestion and saline-alkali land, sandy land and garbage field in-situ remediation comprises a waste treatment technology, a fermentation biogas preparation method, a remediation agent preparation technology, a soil remediation method, a seed selection method and a plant variety planting method; the method specifically comprises the following steps:

(1) firstly, classifying the garbage;

(2) adding microbial flora in cow rumen to rapidly decompose fiber in garbage and rapidly decompose starch garbage;

(3) after the rapid decomposition and decay in the step (2), adding a mixed thermophilic bacteria group which can degrade starch, protein and wood fiber at high temperature to continue fermentation; the soil repairing agent prepared after drying is kept with 20 percent of water content, crushed, packed into 100 KG/bag and stored in a warehouse for standby at normal temperature;

(4) treating saline-alkali desertification soil, and fully mixing the prepared soil remediation agent with the soil to remediate the soil;

wherein the step (1) is specifically as follows: crushing building garbage to manufacture a highway base material or brick, and heating and pressing waste plastics to manufacture an urban slope protection brick; crushing organic garbage into particles with the particle size not more than 6mm, properly adding a biological deodorant, and sorting out the organic garbage, wherein the organic garbage comprises kitchen garbage, human and animal excreta, greening garbage and straws;

adding water into the sorted organic garbage, controlling the water content to be about 87% and the organic garbage content to be about 13%, putting the organic garbage into a fermentation tank, and heating the organic garbage to 38 ℃ for later use;

the method for culturing microbial flora in rumen of cattle comprises selecting healthy and mild adult cattle, feeding refined material or refined material 5 days before liquid collection, feeding dry coarse straw, storing, feeding dry fodder for 10 hr, ruminating overnight, selecting 8 o' clock in the morning, slowly inserting into stomach from nostril with lubricant-coated gastric catheter tube, collecting the outer end of catheter tube with vacuum flask, moving cattle head slightly downward with peristalsis along with rumen after 5 min, collecting 5L after gastric juice flowing into bottle, collecting once gastric juice, performing secondary culture, preparing seed material and performing secondary culture, collecting 5 bean stalks, rice straw, corn stalk, wheat straw at weight ratio of 1:1:1, adding 1% salt 0.05 kg and 1% urea 0.05 kg, preparing coarse material, mixing with 50 deg.C hot water 35 kg, dissolving salt and urea, adding small amount of alkali or plant ash, adjusting pH to 0.2-0.05 kg, adding pH to 9-0.05 kg, fermenting, adding into jar, fermenting, and fermenting at about 24-40 deg.C;

wherein the step (3) is specifically "

Inoculating the seed liquid obtained in the step (2) into the organic garbage raw material pretreated in the step (1), and uniformly mixing and stirring various pretreated substances, wherein the dry substance accounts for about 13% and the water accounts for about 87%; then, the prepared organic garbage is filled into a fermentation tank for fermentation to rapidly decompose and decompose organic matters; performing first fermentation at 35-40 deg.C and pH6-8, turning over for 48 times per day for 2 days until organic matter is completely decomposed;

then, performing second round anaerobic fermentation on the mixed flora, adding methane bacteria and simultaneously adding a mixed thermophilic flora capable of degrading starch, protein and decomposing wood fiber at high temperature: thermomonospora fusca (Thermomonospora fusca) with accession number CC TCC AB 93039; high-temperature protein degrading bacteria: thermoactinomyces vulgaris (Thermoactinomyces vulgaris) with accession number ACCC 41061; high-temperature degradation of wood fiber bacteria: trichoderma asperellum (Trichoderma asperellum) with a preservation number of CGMCC13766, wherein the ratio of the strains is 0-5: 0-5, and the numerical range does not contain 0; the temperature of the fermentation tank is normal temperature, the organic garbage is fully stirred for 12 times every day and fermented for 10 days;

on the 13 th day, adding mixed and homodromous baru composite lactic acid bacteria, and fully mixing and propagating the lactic acid bacteria for 2 days; adsorbing heavy metal ions contained in the lactobacillus to form heavy metal ion clusters, and adsorbing and separating the heavy metal ion clusters through an electrode; the purpose of removing heavy metals is achieved by acid complexing metal ions; the lactobacillus group is liquid Baru composite lactobacillus, and the input proportion accounts for five ten-thousandth of the total substance amount; on day 15, the temperature is kept for 1 day after reaching more than 65 ℃; thermophilic methanogenic bacteria are added to generate high-temperature effective germ killing components; in 15 days, the biogas is discharged completely, organic matters are basically decomposed, odor disappears, the temperature is reduced to be below 40 ℃, the biogas slurry is separated and then continuously recycled for fermentation to prepare biogas, and a centrifuge separates biogas residues to reduce the water content to be below 35%; separating biogas residues to become a nutrient carrier of flora, adding homodromous lactic acid flora, adding silicate flora, bacillus subtilis and rhizobium flora, and adding the components in a ratio of 0-5: 0-5, continuously culturing the bacterial flora at normal temperature to generate biological flora; adding 1% of plant ash, fully mixing, drying and preparing a soil remediation agent; keeping the water content at 20%, crushing, packaging into 100 KG/bag, and storing in a warehouse at normal temperature for later use;

the structure of the fermentation tank used therein is: the fermentation tank is communicated with the sedimentation tank, the fermentation tank is connected with a feeding pipe, the inlet position of the feeding pipe is higher than the outlet position, the upper part of the fermentation tank is connected with a U-shaped overflow pipe, and the inlet position of the U-shaped overflow pipe is higher than the outlet position of the feeding pipe and lower than the inlet position of the feeding pipe; the middle part is equipped with the stirring device that generates heat, and the middle part of fermentation cylinder is equipped with charge device, and the device that generates heat is supported by the support, and the device that generates heat and agitator combination form the stirring device that generates heat, have automatic discharging and feeding device, and automatic dehydration sets up dehydration liquid cyclic utilization.

2. The method for closed-loop waste digestion and saline-alkali land, desertification land and landfill orthotopic remediation as claimed in claim 1, wherein the steps are as follows:

a first step of producing a soil remediation agent according to the method of claim 1;

the second step of land construction of a garbage disposal site: building 37.3 mu of the soil into a unit; 4 meters of setting-out is reserved for the 48 meters of defense line, and a drainage irrigation ditch with the soil trenching caliber of 4 meters wide, the bottom width of 1.5 meters and the depth of 1.5 meters is taken from the 4 meters of defense line; the method is used for drainage and irrigation, then each unit land is leveled, all the land blocks are soaked by water for 6 hours, then the water is discharged from drainage ditches, and the land blocks are aired for 3 to 7 days to ensure that the soil has a water content of 32 percent; 2 tons of the prepared soil repairing agent are put into each mu, the sowing is uniform, and the bottom soil is ploughed to 30cm deep; then, uniformly turning and planing by using a long-tooth harrow, fully mixing the repairing agent and the soil on the surface layer by 0.4 m, and leveling each unit land; ditching an inner ditch with the width of 30CM and the depth of 30CM at every 6 meters by using a ditcher;

thirdly, selecting tree species: planting saline-alkali-resistant red zelkova schneideriana, selecting 2-year-old strong tree seedlings with 40CM soil balls, cutting off 30% of branches to guarantee life cycle, and ensuring the survival rate of seedlings without dehydration; planting 185 plants per mu in 6 meters by 6 meters, and digging pits before planting; planting tree pits with the diameter of 80CM and the depth of 40CM, compacting with fine soil, irrigating thoroughly when watering, and compacting with floating soil after two days; when the water content of the soil is lower than 35 percent, spraying water, and beginning to irrigate the soil in a flood mode so as to prevent the salt content of the diluted deep soil from damaging the saplings; every Longzelkova schneideriana can be used for interplanting 5 rows of paper mulberry trees, and the plant spacing is 1 m; 444 plants can be planted per mu, and 1 meter of thick and strong seedlings are selected;

fourthly, selecting feed tree species, and ecologically breeding pigs: the dry weight feed per mu yield of the paper mulberry is 2000-3000 kg, and ecological pigs are bred;

and fifthly, repairing the environment and soil by the tree: the broussonetia papyrifera and red beech leaves have villi and the function of adsorbing PM2.5, have the functions of adsorbing and decomposing sulfides in the air, decompose polysaccharides by biological bacteria in the growth process of the trees, fuse sandy soil saline and alkaline in soil, and make saline and alkaline crop plant fertilizers absorbed by the trees; the salt and alkali content in the land is lower than 0.1 percent after the land grows for 5 years, and the salt and alkali land is completely eliminated;

and a sixth step: pig manure generated by a feeding field is circulated back to a biogas production factory, and fermentation treatment is carried out to form an ecological closed-loop restoration production integration; the salt and alkali content in the land is less than 0.1 percent after the land grows for 5 years, the salt and alkali soil is completely eliminated, and all indexes reach the agricultural land standard specified by Ministry of agriculture.